Catalogue of vines grown in France

This variety is derived from the natural sowing discovered by Mr. Julien Couston in the beginning of the 1970's. Based on genetic analyses carried out in Montpellier, this vine variety was dribved from the crossbreeding of Grenache and Aubun N.

Synonymy

There are no officially recognized synonyms in France, nor in other countries in the European Union.

Regulations

In France, Couston N is officially listed in the "Catalogue of vine varieties".

Use

Wine grape variety.

Description

Identification signs include:
- the tip of the young shoot has a sparse coat of flat-lying hairs,
- the young leaves are green,
- orbicular or wedge-shaped adult leaves, whole or 3 lobes with an open U-shaped petiolar sinus occasionally with the presence of a tooth at the base, small to moderate size teeth with straight sides, an absence of anthocyanin coloration of veins; a jagged leaf blade, upturned and the underside with an absence or very slight coat of flat-lying and upright hairs,
- elliptical-shaped berries.

Genetic profile

Microsatellite

VVS2

VVMD5

VVMD7

VVMD27

VRZAG62

VRZAG79

VVMD25

VVMD28

VVMD32

Allel 1

131

229

239

176

188

252

240

243

239

Allel 2

143

238

257

191

194

258

240

257

261

Phenology

Bud burst: 3 days before Chasselas.Grape maturity: period II, 3 and 1/2 weeks after Chasselas.

Suitability for cultivation and agronomic production

Couston N is vigorous and has good fertility, grows erect and is well adapted to being short-pruned. When exposed to drying climatic conditions, the berries are susceptible to wilting when approaching grape maturity.

Sensitivity to diseases and pests

Couston N is not too susceptible to downy mildew and not very susceptible to grey rot.

Technological potential

Couston N grape clusters are of moderate size and compactness. The berries are likewise moderate size with very high sugar accumulation potential. Couston N produces full-bodied, tannic, very warm and very colored wines.